Super-Keplerian Frequencies in Accretion Disks. Implications for Mass and Spin Measurements of Compact Objects from X-ray Variability Studies Export

@misc{citeulike:2767132, abstract = {The detection of fast quasi-periodic variability from accreting black holes and neutron stars has been used to constrain their masses, radii, and spins. If the observed oscillations are linear modes in the accretion disks, then bounds can be placed on the properties of the central objects by assuming that these modes are locally sub-Keplerian. If, on the other hand, the observed oscillations correspond to non-linear resonances between disk modes, then the properties of the central objects can be measured by assuming that the resonant modes are excited at the same radial annulus in the disk. In this paper, we use numerical simulations of vertically integrated, axisymmetric hydrodynamic accretion disks to provide examples of situations in which the assumptions implicit in both methods are not satisfied. We then discuss our results for the robustness of the mass and spin measurements of compact objects from variability studies.}, archivePrefix = {arXiv}, author = {Mao, S. A. and Psaltis, D. and Milsom, J. A.}, citeulike-article-id = {2767132}, citeulike-linkout-0 = {http://arxiv.org/abs/0805.0598}, citeulike-linkout-1 = {http://arxiv.org/pdf/0805.0598}, day = {5}, eprint = {0805.0598}, keywords = {accretion, qpo}, month = {May}, posted-at = {2008-05-07 19:36:57}, priority = {2}, title = {Super-Keplerian Frequencies in Accretion Disks. Implications for Mass and Spin Measurements of Compact Objects from X-ray Variability Studies}, url = {http://arxiv.org/abs/0805.0598}, year = {2008} }

TY - ELEC ID - citeulike:2767132 L3 - citeulike-article-id:2767132 N2 - The detection of fast quasi-periodic variability from accreting black holes and neutron stars has been used to constrain their masses, radii, and spins. If the observed oscillations are linear modes in the accretion disks, then bounds can be placed on the properties of the central objects by assuming that these modes are locally sub-Keplerian. If, on the other hand, the observed oscillations correspond to non-linear resonances between disk modes, then the properties of the central objects can be measured by assuming that the resonant modes are excited at the same radial annulus in the disk. In this paper, we use numerical simulations of vertically integrated, axisymmetric hydrodynamic accretion disks to provide examples of situations in which the assumptions implicit in both methods are not satisfied. We then discuss our results for the robustness of the mass and spin measurements of compact objects from variability studies. TI - Super-Keplerian Frequencies in Accretion Disks. Implications for Mass and Spin Measurements of Compact Objects from X-ray Variability Studies KW - accretion KW - qpo AU - Mao, SA AU - Psaltis, D AU - Milsom, JA PY - 2008/May/05/ UR - http://arxiv.org/abs/0805.0598 ER -